Improvement in head-block for saw-mills



To all whom 'it 'may concern:

f l @dnitdietr 'ASA `M'.'Biel/nilo, 'or HILLsBoRoUGH, NEW HAMPSHIRE.` d

Laim raient ivo.v 89,969, man May 11,- 1869.

` mPncvnMrzNT 1N EEADQBLOCK Fon sewn.

The Schedule referred to inthese Letters Patent and making part of thelame.

Be it known thatI, Ash M. BEARD, `of Hillsborough,

in the county of Hillsborough, and State of New Hamp# shire, have invented an Improvement in `I1o ,'-Setting Mechanism for Sawdlills; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is

` a description'of-my invention sucientto enable those v skilled in the art to practise it.

The invention'relates tothe manner of feeding for# `ward the bealn, againstwhich the log isdogged, with reference to the simultaneous forward movement of both ends ofthe log.` ,l j

The invention' primarily consists in combining with the log-suppol'tin g beam, and with the waysnpon which thebeam slides, and pinions, working in gear-racks on the sides ofthese ways, auxiliary pinions, upon the shafts of the main pinions, these auxiliary pinions communi eating end-movement to along gear-toothed` connecting-bar, so that the rotary movement` of one ofthe main pinions not only moves forward the adjacent end of the 4 beam, but lcommunicates movement ,to the other main pinio n, and thereby causes the opposite end ofthe beam to be correspondingly Inovedforward.`

Thedrawings represent a log-'setting mechanism,

` embodying my invention.`

' A shows the' mechanism in plan.

B isa front elevation of the same.

G is an end elevation.

a b denote the ways, or rails. l

c, thebeam, tobthe front faceof which the log to be sawed is fastcnedLthis beam resting upon, and sliding over -the waysr y Fastened to thebeam are bearings, d o, which support vertical shafts, f g,5upon the lower end of each of which is a pinion, h, orih, which meshes into a stationary gear-rack, i, or i', on the side of the adjacent way, or rail a-or b, the rotation of the pinions and their engagement with the rack-teeth communicating motion `to the Ibeam over the Ways, as Willbe readily under-` stood.

Over the lower bearing-plate each pinion-shaft has fixed to it an auxiliary pinion, k, or k'.

Between these pinions` k k and the `rear face of the beam, is abar, l, whiclrests loosely upon the Ways, (or

upon the bearing-plates and slides freely lengthwise i of the beam, and fupon/the face of this bar are geari teeth, with whichwthe teeth of the respective pinions k k engage. i

" Now, "as the main pinion-shaft f is rotated, its pinion h, engaging with `the adjacent rackf-fi, causes the adjacent end of the beam', and the log fastened thereto, to advance on the ways, or toward the saw-cutting lash of the gear-teeth of the main pinion h', I apply a mechanism as follows:

At the top of the shaft'g is fixed a nut, or stationary collar, m, just beneath which is a loose wheel, n, having, on its under surface, ratchet-teethv o, against which the end'of a spring-pawl, p, presses, thespring also pressing the wheel up against the fixed nut m. Now, when the beam is sliding back, the ratchet-teeth slide freely over the pawl, permitting the Wheel to turnV freely with the shaft; but when the beam isbeing fed n forward, the rst tooth of the ratchet brings up against the pawl` and arrests the wheel, and the upward pressure upon the wheel creates friction between the wheel and the nut fixed upon the shaft, sufficient toprevent the shaft and pinion slipping back, or backlashing the parallelism of the successive saw-cut'supon the log, and the consequent uniformity of thickness of the material cut from thelog, being thus insured.

I disclaim anythingfound in the patent granted, June 6, 1854, to DavidRussell. Y

, I claim,.in combination with the longitudinal beam c, to which thelog` issecured, the sliding bar l, (with its vgear-rack,) the stationary gear-racks, or rails a b, the pinions h h', and auxiliary pinions k kf, (the shafts of which turn in bearings fixed to and moving withthe beam 0,) the Whole being constructed and arranged to operate substantially as described.

Also,'in combination withthe above, and withthe auxiliary pinionr k and shaft g, the friction-wheel 'n and l spring-pawl p, substantially as and for the purpose set forth. Y

ASA M. BEARD. Witnesses:

J AMES F. Braces, WINsLoW ill/'minuscron.

aient Wire 

